package org.hylexus.hadoop.hadoop_2_test.mr.sort;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

public class SumStep {

	public static void main(String[] args) throws Exception {
		System.err.println("args0--in");
		System.err.println("args1--out");
		Job job = Job.getInstance(new Configuration());
		job.setJarByClass(SumStep.class);

		job.setMapperClass(SumMapper.class);
		job.setMapOutputKeyClass(Text.class);
		job.setMapOutputValueClass(InfoBean.class);

		FileInputFormat.setInputPaths(job, new Path(args[0]));

		job.setReducerClass(SumReducer.class);
		job.setOutputKeyClass(Text.class);
		job.setOutputValueClass(InfoBean.class);
		FileOutputFormat.setOutputPath(job, new Path(args[1]));

		job.waitForCompletion(true);
	}

	public static class SumMapper extends Mapper<LongWritable, Text, Text, InfoBean> {

		private Text text = new Text();
		private InfoBean b = new InfoBean();

		@Override
		protected void map(LongWritable key, Text value, Mapper<LongWritable, Text, Text, InfoBean>.Context context)
				throws IOException, InterruptedException {
			String line = value.toString();
			String[] item = line.split("\t");
			String account = item[0];
			double in = Double.parseDouble(item[1]);
			double out = Double.parseDouble(item[2]);
			b.set(account, in, out);
			text.set(account);
			context.write(text, b);
		}
	}

	public static class SumReducer extends Reducer<Text, InfoBean, Text, InfoBean> {

		private InfoBean val = new InfoBean();

		@Override
		protected void reduce(Text key, Iterable<InfoBean> value,
				Reducer<Text, InfoBean, Text, InfoBean>.Context context) throws IOException, InterruptedException {
			double in_sum = 0;
			double out_sum = 0;
			for (InfoBean b : value) {
				in_sum += b.getIncome();
				out_sum += b.getExpenses();
			}
			val.set(key.toString(), in_sum, out_sum);
			context.write(key, val);
		}
	}

}
